Which explains why the lawsmotion are scientific laws?
O A. The theories of motion became laws after there was enough
evidence to prove they were true.
O B. The laws cannot be tested by experiments, but scientists know
that they are correct because they make sense mathematically.
c. The laws explain how objects move and are supported by
experimental evidence.
O D. The laws describe a wide range of observations of motion and can
be used to predict the motion of objects.
Did

Answers

Answer 1

Answer:

Answer:

Explanation:

Scientific laws describe how things work with little to no exception. They do NOT provide an explanation to WHY something occurs.

Answer 2

Answer:

Answer:

The answer is D because scientific laws describe how things work not why they happen.

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A (a) is a pure substance that cant be broken down into simpler substances by chemical or physical means a) element b) mineral c) chemical d) atom

Central American countries are important agricultural producers. Each year, the United States imports about five billion dollars’ worth of __________.a. bananas
b. cacao
c. mangoes
d. coffee

Answers

a. bananas

Central American countries are important agricultural producers. Each year, the United States imports about five billion dollars’ worth of bananas.

NOT:

b. cacao
c. mangoes
d. coffee

correct answer is D COFFEE

A gas contains a mixture of NH3(g) and N2H4(g), both of which react with O2(g) to form NO2(g) and H2O(g). The gaseous mixture (with an initial mass of 61.00 g) is reacted with 10.00 moles O2, and after the reaction is complete, 4.062 moles O2 remains. Calculate themass percent of N2H4(g) in the original gaseous mixture.

Answers

Answer:

Mass percent of N2H4 in original gaseous mixture = 31.13 %

Explanation:

Given:

Initial mass of gaseous mixture = 61.00 g

Initial mole of oxygen = 10.0 mol

Moles of oxygen remaining after the reaction = 4.062 mol

Moles of oxygen used = 10.0 - 4.062 = 5.938 mol

$4NH_3 + 7O_2\rightarrow 4NO_2 + 6H_2O$

$N_2H_4 + 3O_2\rightarrow 2NO_2 + 2H_2O$

Total oxygen used in both the reactions = 10.0 parts

out of 10 parts, 3 part react with N2H4.

$No.\;of\;moles\;of \;oxygen \;used = 5.398*(3)/(10) =1.78\; moles$

Now, consider the reaction of N2H4

$N_2H_4 + 3O_2\rightarrow 2NO_2 + 2H_2O$

3 moles of O2 react with 1 mole of N2H4

1.78 moles of oxygen will react with 1.78/3 = 0.5933 mol of N2H4

$Mass = Moles* Molecular mass$

Molecular mass of N2H4 = 32 g/mol

$Mass\;of\;N_2H_4= 0.5933* 32 = 18.99 g$

$Mass\;percent = (Mass\;of\;N_2H_4)/(Total\;mass)* 100$

Total mass = 61.0 g

$Mass\;percent = (18.99)/(61.0)* 100=31.13 \%$

Final answer:

The mass percent of N2H4 in the gaseous mixture can be determined through stoichiometric calculations and determining the limiting reactant. The initial and remaining amounts of O2 are used to calculate the reacted amount of O2, which then allows for the calculation of the amount of N2H4. This information is used in the mass percent formula.

Explanation:

The balanced reaction states that for one mole of NH3, one mole of O2 is required, while for one mole of N2H4, 3 moles of O2 are required. Thus, the initial moles of O2 were 10 moles and after reaction 4.062 moles O2 remained. Thus, the reacted amount of O2 is 10 - 4.062 = 5.938 moles. From calculating the limiting reactant and applying stoichiometry, the amount of N2H4 can be determined. We know the molar mass of N2H4 is 32 g/mole. By calculating the molar ratio, we can then calculate the mass percent of N2H4 in the mixture using the formula: (mass of N2H4 / total mass) * 100%.

Learn more about Stoichiometric Calculations here:

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An increase in the surface area of reactants in a heterogeneous reaction will result in what?

Answers

It will result in an increase in the rate of rxn

If you mix metal oxide with water, the solution will be acidic. true false

Answers

Answer: False

Explanation:

Metal oxides that dissolve in water, react with water to form basic solutions.

Nonmetal oxides react with water to form acidic solutions.

Final answer:

False. The nature of the solution actually depends on the type of metal oxide. Not all metal oxides will make water acidic when mixed.

Explanation:

The statement that mixing metal oxide with water will result in an acidic solution is generally false.

Actually, the nature of the solution (acidic, basic, or neutral) after mixing metal oxide with water depends on the type of metal oxide. Some metal oxides, particularly those of alkali metals and alkaline earth metals (Group 1 and 2 in the Periodic Table), form basic solutions when dissolved in water. For instance, sodium oxide or magnesium oxide will react with water to form their respective hydroxides, which are basic in nature.

However, certain metal oxides like aluminum oxide or zinc oxide may react with water to form amphoteric solutions (can behave as both acids and bases).

Thus, not all metal oxides will make the water acidic when mixed.

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What is produced when an acid reacts with a metal?a. Salt and hydrogen
c. Water and base
b. Carbon and salt
d. Carbon dioxide and water

Answers

Answer: Option (a) is the correct answer.

Explanation:

When an acid reacts with a metal then there occurs formation of a salt along with liberation of hydrogen gas.

For example, $Zn + 2HCl \rightarrow ZnCl_(2) + H_(2)$

Here, Zn (zinc) is the metal which when added to hydrogen chloride acid them it leads to the formation of salt zinc chloride and hydrogen gas.

This type of reaction is also known as single displacement reaction.

Thus, we can conclude that salt and hydrogen is produced when an acid reacts with a metal.

The answer should be A. The metal will replace the hydrogen as the cation which will result in the a salt and hydrogen gas. An example is Mg reacting with HCl which produces MgCl₂ (salt) and H₂ (hydrogen).

I hope this helps. Let me know if anything is unclear.

An atom of lithium 7 has an equal number of

Answers

Electrons and protons

Lithium 7 has an equal number of protons and neutrons.

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